Includes all 3 harnesses needed to use a 2018 Mustang GT manifold on a 2015-2017 Mustang GT and retain use of the CMCV / IMRC / CMRC system. Complete plug and play compatibility, no need to rewire anything yourself. Get to making more power, sooner. 2011-2014 Mustang GT did not have variable runner length intake on the intake manifold. These harnesses will not work with 2011-2014 Mustang GT.